CDL COMBINATION PRACTICE TEST SOUTH DAKOTA
11.
When you make a quick lane change, the crack-the-whip effect can:
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the trailer to swing wide to the left.
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turn the trailer over.
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make it harder to turn without skidding.
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improve your traction.
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12.
If the drive wheels begin to spin when accelerating, you should:
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take your foot off the accelerator.
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set the parking brake.
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continue to accelerate.
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brake gently.
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13.
When driving on slippery surfaces, you should:
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change lanes often.
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not pass slower vehicles unless necessary.
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make turns as quickly as possible.
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All of the above.
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14.
You should not use the trailer hand brake to straighten out a jackknifing trailer. Why?
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The brakes on the trailer wheels will not respond.
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The brakes on the trailer wheels caused the skid in the first place.
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You should use the emergency break instead.
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You should use the service break instead.
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15.
Which of these is NOT part of the basic method for shifting up?
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Accelerate while pressing the clutch and turn toward the driver's side.
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Release the accelerator, push in the clutch and shift to neutral at the same time.
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Release the clutch and press the accelerator at the same time.
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Push in the clutch and shift to the higher gear at the same time.
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16.
To test the service brake:
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push the brake pedal firmly while going about 5 mph.
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shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
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gently try to pull forward with the trailer parking brake on, then release the brake.
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push the brake pedal firmly while slowly moving backward.
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17.
You are checking the tractor-trailer connection to make sure it is safe and secure. The landing gear should be:
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raised slightly off the ground.
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fully raised.
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fully lowered.
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None of the above.
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18.
Broken suspension parts can be very dangerous. When inspecting your vehicle for suspension system defects, look for:
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Damaged air suspension systems.
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Broken leaves in a multi-leaf spring.
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Spring hangers that allow movement of axle from proper position.
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All of the above.
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19.
The emergency air line:
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controls the emergency brakes on combination vehicles.
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causes the tractor protection valve to close when the emergency line loses pressure.
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supplies air to the trailer air tanks.
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All of the above.
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20.
If a load is 10 feet long, the minimum number of tie-downs required is:
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4
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3
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2
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1
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